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Crankshaft -POLINI Evolution 2 44mm Hub, 85mm con-rod- Piaggio 50 cc 2-stroke (for 13mm gudgeon pin)

partnumber P2100021

Delivery time: 1-2 days, Express 1 day*
Polini’s Evolution 2 long-stroke crankshaft with a stroke of 44 mm - the perfect addition to the big bore kits!
Naturally, this is a full-circle crankshaft, reducing the volume of the crankcase, thereby increasing initial compression. Therefore, it is often referred to as an “HPC” (high primary compression) shaft. The effect of this fine piece of engineering is an improved scavenging of the cylinder, especially at high RPMs. In addition, plastic inserts have been used to create perfect balancing.
The con-rod is forged for heavy duty usage and provides for an improved flow thanks to the optimised design. Likewise, the lower con-rod bearing is very durable and perfectly engineered by Polini to suit high-end cylinders’ RPMs.
Furthermore, the vario taper is massively reinforced and comes with a diameter of 16 mm. That’s why they are perfectly complemented by Polini’s Evolution variators. Included in delivery is everything necessary to install Polini’s P241460 and P241561 varios. If you are contemplating on using a variator from another manufacturer, extensive modifications are required.
As to be expected, machining of the crankcase is necessary to be able to use these fine pieces. Otherwise, the enlarged crank webs will not fit.
Vielen Dank für Deine Bewertung!

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